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'j attriti dtiiiirr HYAM J. HYAMS, 0F PITTSBURG, PENNSYLVANIA.

.ette'rs Patent N 107,380, dated September 13,1870.

IMPROVEMENT IN GAS-METERS.

Th'a Schedule referred. to in these Lettere Patent and making part of the sama To all whom it may concern:

vaccordance with my invention;

Figure 2 is a vertical central section of the same,

vcorresponding with fig. 1; and

Figure 3 is a sectional riew 'of one of the slidevalves and its seat. l

Similar letters of reference indicate parts in the several iigures.

This invention relates t0 drygas-meters where the corresponding .gas is mixed with air or other Vgases and' t rstly consistsin a' meter constructed with three or more diaphragme, which are arranged within a corresponding number of compartments, whereby there are formed, ou opposite sides of each diaphragm,

two chambers, one et' which is exclusively used for gas, while` the outer is used for air or the mixing gases.

It secondly consists in regulating or change-valves in the sides ofthe meter, for regulating the quantity of air or. other gases to be mixed.

1t thirdly cousistsin providing an extra port in the i valve-seats of the slide-valves for the admittance ofl air or mixing gases. v

`To enable others to construct gas-meters iu accordance with my invention, lwill proceed to describe the .same with reference'to the drawing.

A' A are compartments or measuring-chambers formed inside of the case of the meter.,

These chambers are separated from each other by the lixed partitions a a, andthe movable f liaphragms The inner chambers A are exclusively used for gas, while the outer chambers A are used l'or air or mining gases.

The drawing shows a meter with three diaphragms,

in which case the Vchambers are made of triangular f form. `'.ihe movable diaphragms B B are so arranged as to form'the' partition between the inner and outer chambers A A'.

CA is a compartment formed ou top of the' measuring-chambers A A', withinthe case of thevlneter, to contain the sliding valves D D, and the operating mechaiism whereby said valves and the register' are werke r The valves D D are eachprovided. in theirface r with four ports, d e f g.

the outside of the meter, so that -itsupper portion mayommuuicate with the compartment C, while its lowerportion is in communicationwiththe outer chamber A.

lheyare fastened tightlyto their seats E E', but

pivot, h, which is fast in said seats, and by a nut, i.

vzilves, are made to communicate respectively with thc ports Z m n, provided tothe seats E 141', and thereby with the chambers Af, and, by means of thc channels o p, with the ports 'f g in the seats D' D'.

.F is the induction-pipe connected with the main pipe, and opens into the compartment C.`

.G is the duction-pipe, which communicates with troughs q e'.

The operation of this meter is as follows: l The gas which enters the compartment() through the npipe F is allowed to pass alternately through one of the ports, (1, as they are' uncovered by the valves D 1i, into one of the inner' chambers, A',

whereby the diaphragm is moved outward, thus forc-- ing the air contained in the outer chamber A through the port a, cavity 1.', port on, channel p, port j, cavity 1), port e, into the trough'q, where vit mixes with the gas to pass oli t-ln'ougli the trough 'r to the eductionpipe G.

When the valve D closes the port d the diaphragm cavities l) c allow the gas contained in the latter to pass out of it, through the-ports d e, into the trough q, and at the same time allow the air to fill -up'the outer chamber, through the opening j, pcrt'l, channel o, ports g f; channel p', port in, cavity k, and port n, as clearly shown in iig. 3, the-dow of the gasmdair being indicated by arrows.

, The diaphragme, -being linked Atogothcrand also connected with the sliding valves, as shown in the the several ports in the valve-seats D.

To change theA 'quantity of air to the gas', one or two of the regulating-valves E are turned half round, xvhercby-'theports l m are closed' up, whilethe port a isv open to the atmosphere, and i the air passingintojthe chambers A' is -expelled again tothe outside of the meter. Thus, greater facility for mixing gas and regulating the proportion of the mixture is obtained than by mixing-meters at jpresent adopted.v r

with two' cavities, l aand work on seats D',l made E E are regulating or change-valves, arranged to allowed to turn thereon by means of a central screw- An opening, j, andcavity le, on the face of 'these the ports loi' tho valveseats D D', by means 'of the moves back again toward t-hc inner chamber, and the 1 drawing, enable the valves D to alternately close and'. open the ports d, to the eompartmeutO, adhave a co1 responding communication established between be mixed' wan A. very important feature of this invention, viz., the additionalportfg, provided in the valve-seat for the admission oi' air, is capable of modification to suit various valves, acconding to the form and nature of the movement of such valves.

What is here claimed, and desired to be secured byl Letters Patent, is-

1. 'lhc arrangement of three 91' more d iaphragms,

and corresponding double system of measuring-chamhers'A A', substantially as and for the purpose herein described.

2. The additional port g provided in the vnlve-seah for the admission of air, substantially as herein described.

3. The regulating-valves E E, and their seats E' E', constructed substantially as and for the purpose herein set; fort-h.

HYAM J. HYAMS.

Witnesses FRANCIS Tonnsxon, ALBERT Ismos. 

